[Mesa-dev] [RFC] [PATCH 0/3] Make Gallium aware of GL_TEXTURE_RECTANGLE

Marek Olšák maraeo at gmail.com
Wed Aug 11 15:34:09 PDT 2010

On Wed, Aug 11, 2010 at 10:07 PM, Luca Barbieri <luca at luca-barbieri.com>wrote:

> > Because all nvidia hardware seems to have the normalized bit as a
> property
> > of a resource (PIPE_TEXTURE_RECT or a flag would be okay here), and all
> > hardware has the normalized bit as part of the texture instruction (it's
> a
> > shader state, so a driver looks for TGSI_TEXTURE_RECT), I believe it
> would
> > really be best for everyone to have this RECT texture target type and
> > removing normalized_coords from pipe_sampler_state. Luca, you've already
> > done some work for this change. If you don't have time to finish
> > PIPE_TEXTURE_RECT, I'll do that.
> So no hardware at all supports specifying the normalization as part of
> the sampler state?
> One has to keep in mind OpenCL though, which has the following API:
> cl_sampler clCreateSampler (cl_context context,
>    cl_bool normalized_coords,
>    cl_addressing_mode addressing_mode,
>    cl_filter_mode filter_mode, cl_int *errcode_ret)
> If you put the bit in the resource itself, then it becomes impossible
> to change the normalization without copying the whole resource, which
> would seem to be a major problem for implementing OpenCL.
> A possible solution could be removing the bit from the sampler state
> and adding the bit to both TEX instructions and sampler views.
> This would seem to suit nv50, which has it in the hardware sampler
> view, and r300-r700 which has it in the hardware shader instruction
> (according to you).

Page 301 (335 of the PDF): TEX_DWORD1, the 4 last bit fields.

It looks like AMD were outvoted in the OpenCL spec.

Is R800 different? I don't know.

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